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A full-disk image standardization of the chromosphere observation at Huairou Solar Observing Station
استاندارد سازی دیسک کامل تصویر از مشاهده کروموسفر در ایستگاه مشاهده خورشیدی Huairou-2020 Observations of local features in the solar chromosphere began in 1992 at Huairou Solar Observing Station, while the full-disk chromosphere
observations were carried out since 2000. In order to facilitate researchers to use full-disk chromosphere observation, algorithms
have been developed to standardize the full-disk images. The algorithms include the determination of the center of the image
and size standardization, geometric correction and intensity normalization. The solar limb of each image is determined from a histogram
analysis of its intensity distribution. The center and radius are then calculated and the image is corrected for geometric distortions.
Images are re-scaled to have a fixed radius of 500 pixels and centered within the 1024 1024 frame. Finally, large-scale variations in
intensity, such as limb-darkening, are removed using a median filter. This paper provides a detailed description of these algorithms,
and a summary of the properties of these chromospheric full-disk observations to be used for further scientific investigations. Keywords: Chromosphere | Data standardization | Physical parameters | Big data |
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